Intravitreal injector

ABSTRACT

Provided herein are needle assemblies for intravitreal injection of an implant into an eye of a patient through an unsheathed state and a sheathed state. Such needle assemblies are precise and accurate for proper treatment and prevent further damage to the eye.

CROSS-REFERENCE

This application is a continuation of U.S. patent application Ser. No.16/798,219 filed Feb. 21, 2020, which claims the benefit of U.S.Provisional Application No. 62/924,116, filed Oct. 21, 2019, which ishereby incorporated by reference in its entirety herein.

BACKGROUND

Ocular injection of solid or particulate medicament must be precise andaccurate for proper treatment and prevention of further damage to theeye.

SUMMARY

One aspect provided herein is a needle assembly for injecting an implantinto an eye of a patient having an unsheathed state and a sheathedstate, the assembly comprising: a needle housing having a proximal endand a distal end; a needle having a proximal end attached to the distalend of the needle housing or within the needle housing, a distal endextending beyond the distal end of the needle housing, and a needlelumen at the distal end of the needle; the implant positioned inside theneedle lumen; and a push pin having a head and a push rod, wherein adistal end of the push rod is disposed within the needle lumen, andwherein translating the push pin in a distal direction ejects theimplant from the needle lumen and into the eye of the patient.

In some embodiments, the needle assembly further comprises a resilientmember disposed within the needle housing. In some embodiments, theresilient member proximally biases the push pin. In some embodiments,the resilient member is a spring, a flexure, a piston, a motor, a band,or any combination thereof. In some embodiments, the needle assemblyfurther comprises a needle sheath having a proximal portion surroundingthe distal end of the needle housing, and a distal portion surroundingthe distal end of the needle. In some embodiments, the needle sheath ispierced by the needle by translating in a distal direction away from theneedle housing to expose the needle. In some embodiments, the needlesheath translates proximally to the unsheathed state where the distalend of the needle extends beyond the distal portion of the needlesheath. In some embodiments, the distal portion of the needle sheathabuts the eye of the patient when the implant is ejected from the needlelumen. In some embodiments, the needle assembly further comprises aneedle seal at the distal end of the needle that seals the distal end ofthe needle lumen. In some embodiments, needle seal is within a distalportion of the needle sheath. In some embodiments, the needle seal isformed of a polymer. In some embodiments, the needle seal is pierced bytranslating the needle sheath in a proximal direction. In someembodiments, the needle has a length such that the distal end of theneedle is within the needle seal when the system is in a sheathed state.In some embodiments, the needle assembly further comprises a removablepush pin retainer that prevents movement of the needle housing relativeto the needle sheath when engaged. In some embodiments, the removablepush pin retainer removably couples the push pin to the needle housing.In some embodiments, the removable push pin retainer removably couplesthe needle housing to a side wall of the needle sheath. In someembodiments, the implant is loaded in the needle lumen between thedistal end of the push pin and the distal end of the needle. In someembodiments, the implant has a shape of elongated cylinder. In someembodiments, the implant comprises a plurality of particles. In someembodiments, the implant has a cross sectional shape of a circle, atriangle, a square, a rectangle, or any other polygon. In someembodiments, the needle has a gauge of 20 to 40. In some embodiments,the needle has a gauge of 20 to 22, 20 to 24, 20 to 26, 20 to 28, 20 to30, 20 to 32, 20 to 34, 20 to 36, 20 to 38, 20 to 40, 22 to 24, 22 to26, 22 to 28, 22 to 30, 22 to 32, 22 to 34, 22 to 36, 22 to 38, 22 to40, 24 to 26, 24 to 28, 24 to 30, 24 to 32, 24 to 34, 24 to 36, 24 to38, 24 to 40, 26 to 28, 26 to 30, 26 to 32, 26 to 34, 26 to 36, 26 to38, 26 to 40, 28 to 30, 28 to 32, 28 to 34, 28 to 36, 28 to 38, 28 to40, 30 to 32, 30 to 34, 30 to 36, 30 to 38, 30 to 40, 32 to 34, 32 to36, 32 to 38, 32 to 40, 34 to 36, 34 to 38, 34 to 40, 36 to 38, 36 to40, or 38 to 40. In some embodiments, the needle has a gauge of 20, 22,24, 26, 28, 30, 32, 34, 36, 38, or 40. In some embodiments, the needlehas a gauge of at least 20, 22, 24, 26, 28, 30, 32, 34, 36, or 38. Insome embodiments, the needle has a gauge of at most 22, 24, 26, 28, 30,32, 34, 36, 38, or 40. In some embodiments, the needle has a gauge of 23to 30. In some embodiments, the needle has a gauge of 23. In someembodiments, the needle has a gauge of 30. In some embodiments, theneedle is straight. In some embodiments, the needle is curved.

Another aspect provided herein is an injector system for injecting animplant into an eye of a patient having an unsheathed state and asheathed state, the system comprising: a plunger assembly comprising: aplunger housing; and a plunger slidably disposed within the plungerhousing, wherein a distal end of the plunger engages the push pin of theneedle assembly when in a distal position within the plunger housing;and the needle assembly

In some embodiments, the distal end of the plunger engages the head ofthe push pin. In some embodiments, the plunger is manually actuated totranslate distally within the plunger housing. In some embodiments, theplunger housing is a syringe barrel. In some embodiments, the syringebarrel is a 1 mL syringe barrel. In some embodiments, the plungerhousing is a biopsy punch. In some embodiments, a proximal end of thesyringe plunger protrudes beyond the plunger housing. In someembodiments, the plunger is mechanically actuated to translate distallywithin the plunger housing. In some embodiments, the plunger assemblyfurther comprises a compression spring biasing the plunger towards aproximal end of the plunger housing. In some embodiments, thecompression spring has a distal end connected to the plunger housing anda proximal end connected to the plunger. In some embodiments, theplunger comprises a first stop feature, wherein the plunger housingcomprises a second stop feature engageable with the first stop feature.In some embodiments, the second stop feature comprises a primary secondstop and a retracted second stop.

Another aspect provided herein is an injector system for injecting animplant into an eye of a patient having an unsheathed state and asheathed state, the system comprising: a plunger assembly comprising: aplunger housing; and a plunger slidably disposed within the plungerhousing, wherein a distal end of the plunger engages the push pin of theneedle assembly when in a distal position within the plunger housing;and a needle assembly comprising: a needle housing having a proximal endand a distal end; a needle having a proximal end attached to the distalend of the needle housing or within the needle housing, a distal endextending beyond the distal end of the needle housing, and a needlelumen at the distal end of the needle; the implant positioned inside theneedle lumen; and a push pin having a head and a push rod, wherein adistal end of the push rod is disposed within the needle lumen, andwherein translating the push pin in a distal direction ejects theimplant from the needle lumen and into the eye of the patient.

In some embodiments, the distal end of the plunger engages the head ofthe push pin. In some embodiments, the plunger is manually actuated totranslate distally within the plunger housing. In some embodiments, theplunger housing is a syringe barrel. In some embodiments, the syringebarrel is a 1 mL syringe barrel. In some embodiments, the plungerhousing is a biopsy punch. In some embodiments, a proximal end of thesyringe plunger protrudes beyond the plunger housing. In someembodiments, the plunger is mechanically actuated to translate distallywithin the plunger housing. In some embodiments, the plunger assemblyfurther comprises a compression spring biasing the plunger towards aproximal end of the plunger housing. In some embodiments, thecompression spring has a distal end connected to the plunger housing anda proximal end connected to the plunger. In some embodiments, theplunger comprises a first stop feature, wherein the plunger housingcomprises a second stop feature engageable with the first stop feature.In some embodiments, the second stop feature comprises a primary secondstop and a secondary second stop. In some embodiments, the needleassembly further comprises a resilient member disposed within the needlehousing. In some embodiments, the resilient member proximally biases thepush pin. In some embodiments, the resilient member is a spring, aflexure, a piston, a motor, a band, or any combination thereof. In someembodiments, the needle assembly further comprises a needle sheathhaving a proximal portion surrounding the distal end of the needlehousing, and a distal portion surrounding the distal end of the needle.In some embodiments, the needle sheath is removable from the needlehousing by translating in a distal direction away from the needlehousing to expose the needle. In some embodiments, the needle sheathtranslates proximally to the unsheathed state where the distal end ofthe needle extends beyond the distal portion of the needle sheath. Insome embodiments, the distal portion of the needle sheath abuts the eyeof the patient when the implant is ejected from the needle lumen. Insome embodiments, the injector system further comprises a needle seal atthe distal end of the needle that seals the distal end of the needlelumen. In some embodiments, the needle seal is within a distal portionof the needle sheath. In some embodiments, the needle seal is formed ofa polymer. In some embodiments, the needle seal is pierced by the needleby translating the needle sheath in a proximal direction. In someembodiments, the needle has a length such that the distal end of theneedle is within the needle seal when the system is in a sheathed state.In some embodiments, the needle assembly further comprises a removablepush pin retainer that prevents movement of the needle housing relativeto the needle sheath when engaged. In some embodiments, the removablepush pin retainer removably couples the push pin to the needle housing.In some embodiments, the removable push pin retainer removably couplesthe needle housing to a side wall of the needle sheath. In someembodiments, the implant is loaded in the needle lumen between thedistal end of the push pin and the distal end of the needle. In someembodiments, the implant has a shape of elongated cylinder. In someembodiments, the implant comprises a plurality of particles. In someembodiments, the implant has a cross sectional shape of a circle, atriangle, a square, a rectangle, or any other polygon. In someembodiments, the needle has a gauge of 20 to 40. In some embodiments,the needle has a gauge of 20 to 40. In some embodiments, the needle hasa gauge of 20 to 22, 20 to 24, 20 to 26, 20 to 28, 20 to 30, 20 to 32,20 to 34, 20 to 36, 20 to 38, 20 to 40, 22 to 24, 22 to 26, 22 to 28, 22to 30, 22 to 32, 22 to 34, 22 to 36, 22 to 38, 22 to 40, 24 to 26, 24 to28, 24 to 30, 24 to 32, 24 to 34, 24 to 36, 24 to 38, 24 to 40, 26 to28, 26 to 30, 26 to 32, 26 to 34, 26 to 36, 26 to 38, 26 to 40, 28 to30, 28 to 32, 28 to 34, 28 to 36, 28 to 38, 28 to 40, 30 to 32, 30 to34, 30 to 36, 30 to 38, 30 to 40, 32 to 34, 32 to 36, 32 to 38, 32 to40, 34 to 36, 34 to 38, 34 to 40, 36 to 38, 36 to 40, or 38 to 40. Insome embodiments, the needle has a gauge of 20, 22, 24, 26, 28, 30, 32,34, 36, 38, or 40. In some embodiments, the needle has a gauge of atleast 20, 22, 24, 26, 28, 30, 32, 34, 36, or 38. In some embodiments,the needle has a gauge of at most 22, 24, 26, 28, 30, 32, 34, 36, 38, or40. In some embodiments, the needle has a gauge of 23 to 30. In someembodiments, the needle has a gauge of 23. In some embodiments, theneedle has a gauge of 30. In some embodiments, the needle is straight.In some embodiments, the needle is curved.

Another aspect provided herein is an injector system for injecting animplant into an eye of a patient having an unsheathed state and asheathed state, the system comprising: a needle assembly comprising: aneedle housing having a proximal end and a distal end; a needle having aproximal end attached to the distal end of the needle housing or withinthe needle housing, a distal end extending beyond the distal end of theneedle housing, and a needle lumen at the distal end of the needle; theimplant positioned inside the needle lumen; and a push pin having a headand a push rod, wherein a distal end of the push rod is disposed withinthe needle lumen, and wherein translating the push pin in a distaldirection ejects the implant from the needle lumen and into the eye ofthe patient; and a plunger assembly removably coupled to the needleassembly, wherein the plunger assembly comprises: a plunger housing; anda plunger slidably disposed within the plunger housing, wherein a distalend of the plunger engages the push pin of the needle assembly when in adistal position within the plunger housing.

Another aspect provided herein is a method for injecting an implant intoan eye of a patient, wherein the method comprises: providing an injectorsystem for injecting an implant into an eye of a patient having anunsheathed state and a sheathed state, the system comprising: a needleassembly comprising: a needle housing having a proximal end and a distalend; a needle having a proximal end attached to the distal end of theneedle housing or within the needle housing, a distal end extendingbeyond the distal end of the needle housing, and a needle lumen at thedistal end of the needle; the implant positioned inside the needlelumen; and a push pin having a head and a push rod, wherein a distal endof the push rod is disposed within the needle lumen, and whereintranslating the push pin in a distal direction ejects the implant fromthe needle lumen and into the eye of the patient; and a plunger assemblyremovably coupled to the needle assembly, wherein the plunger assemblycomprises: a plunger housing; and a plunger slidably disposed within theplunger housing; and engaging a distal end of the plunger with the pushpin of the needle assembly to inject the implant into the eye of thepatient.

BRIEF DESCRIPTION OF THE DRAWINGS

The novel features of the disclosure are set forth with particularity inthe appended claims. A better understanding of the features andadvantages of the present disclosure will be obtained by reference tothe following detailed description that sets forth illustrativeembodiments, in which the principles of the disclosure are utilized, andthe accompanying drawings of which:

FIG. 1 shows a perspective illustration of an exemplary first injectorsystem in a sheathed state, per some embodiments herein;

FIG. 2 shows a perspective illustration of an exemplary first injectorsystem in an unsheathed state, per some embodiments herein;

FIG. 3 shows an exploded perspective illustration of an exemplary firstinjector system, per some embodiments herein;

FIG. 4 shows a cross-sectional illustration of an exemplary firstinjector system in a sheathed state, per some embodiments herein;

FIG. 5 shows a cross-sectional illustration of an exemplary firstinjector system in an unsheathed state, per some embodiments herein;

FIG. 6 shows a detailed cross-sectional illustration of a needleassembly of the exemplary first injector system, per some embodimentsherein;

FIG. 7 shows a detailed cross-sectional illustration of a plungerassembly of the exemplary first injector system, per some embodimentsherein;

FIG. 8 shows a perspective illustration of an exemplary second injectorsystem in a sheathed state, per some embodiments herein;

FIG. 9 shows a perspective illustration of an exemplary second injectorsystem in an unsheathed state, per some embodiments herein;

FIG. 10 shows a cross-sectional illustration of an exemplary secondinjector system in a sheathed state, per some embodiments herein;

FIG. 11 shows a cross-sectional illustration of an exemplary secondinjector system in an unsheathed state, per some embodiments herein;

FIG. 12 shows a perspective illustration of a plunger assembly of anexemplary second injector system, per some embodiments herein;

FIG. 13 shows a cross-sectioned perspective illustration of a plungerassembly of an exemplary second injector system, per some embodimentsherein;

FIG. 14 shows a perspective illustration of a needle assembly of anexemplary second injector system, per some embodiments herein;

FIG. 15 shows a cross-sectioned perspective illustration of a needleassembly of an exemplary second injector system, per some embodimentsherein;

FIG. 16 shows a front view illustration of an exemplary injector systemcomprising a biopsy punch, per some embodiments herein;

FIG. 17 shows a front cross-sectioned view illustration of the exemplaryinjector system comprising a biopsy punch, per some embodiments herein;

FIG. 18 shows an exploded illustration of the exemplary injector systemcomprising a biopsy punch, per some embodiments herein;

FIG. 19 shows an exploded illustration of an exemplary injector systemcomprising a biopsy punch and a retractable needle seal, per someembodiments herein;

FIG. 20 shows exploded and cross-sectioned illustrations of an exemplaryinjector system comprising a syringe and a retractable needle seal, persome embodiments herein;

FIG. 21 shows an illustration of an exemplary injector system comprisinga biopsy punch within a syringe or other full-length tube, per someembodiments herein;

FIG. 22 shows illustrations of an exemplary injector system comprising asyringe and a primary needle and removable needle seal assembly in anunsheathed and a sheathed state, per some embodiments herein;

FIG. 23 shows illustrations of an exemplary injector system comprising asyringe and a secondary needle and removable needle seal assemblies, persome embodiments herein;

FIG. 24 shows an illustration of an exemplary injector system comprisinga syringe and a removable push pin retainer, per some embodimentsherein;

FIG. 25 shows a perspective cross-sectioned illustration of an exemplarythird injector system, per some embodiments herein;

FIG. 26 shows front view illustrations of exemplary plungers of thethird injector system, per some embodiments herein;

FIG. 27 shows a first set detailed front view illustrations of exemplaryplungers of the third injector system, per some embodiments herein;

FIG. 28 shows a second set detailed front view illustrations ofexemplary plungers of the third injector system, per some embodimentsherein;

FIG. 29 shows a third set detailed front view illustrations of exemplaryplungers of the third injector system, per some embodiments herein;

FIG. 30 shows front cross-sectioned view illustrations of an exemplaryplunger housing of the third injector system, per some embodimentsherein; and

FIG. 31 shows detailed front cross-sectioned view illustrations of anexemplary plunger housing of the third injector system, per someembodiments herein.

DETAILED DESCRIPTION

There is currently an unmet need for devices that precisely andaccurately intravitreally inject solid or particulate implants.Particularly a device that is simple and intuitive to operate and relieson the clinician-familiar syringe mechanism. Further, there is an unmetneed for a device that affords the versatility of employing a variety ofneedle assemblies based on the implant sizes and/or the needle diameter.Finally, there is a need for a device that is economical to manufactureand whose reusability reduces its environmental impact.

First Injector System

Provided herein per FIGS. 1-7 is a first injector system 100 forinjecting an implant into an eye of a patient, the system 100 comprisinga needle assembly 210 and a plunger assembly 110. As shown in FIG. 3 ,the needle assembly 210 removably couples to a distal end of the plungerassembly 110. In some embodiments, the needle assembly 210 removablycouples to a distal end of the plunger assembly 110 by a snap, a screw,a pin, a band, a clamp, or any combination thereof. Alternatively, insome embodiments, the needle assembly 210 permanently couples to theplunger assembly 110. In some embodiments, the needle assembly 210 ismaneuverable between a sheathed state and an unsheathed state. FIG. 1shows a sheathed state of the needle assembly 210, and FIG. 2 shows anunsheathed state of the needle assembly 210. In some embodiments, theplunger assembly 110 is maneuverable between an extended position and aretracted position.

As seen per FIGS. 4-6 the exemplary needle assembly 210 comprises aneedle housing 250, a needle 260, and a push pin 290. In someembodiments, the needle assembly 210 further comprises the implantloaded in the needle 260. In some embodiments, the needle assembly 210further comprises the implant loaded in a lumen of the needle 260.

As shown, the needle housing 250 has a proximal end and a distal end.Further, as shown, the needle housing 250 comprises a male luer taper, athru-hole, a first cavity, and a second cavity. Alternatively, in someembodiments, the needle housing 250 does not comprise one or more of themale luer taper, the thru-hole, the first cavity, and the second cavity.In some embodiments, two or more of the male luer taper, the thru-hole,the first cavity, and the second cavity are concentric. As shown, adistal termination of the first cavity is distal to the distaltermination of the male luer taper. As shown, a proximal termination ofthe first cavity is distal to the distal termination of the male luertaper.

As shown, the needle 260 comprises a needle lumen at the distal end ofthe needle 260 and a female luer taper at the proximal end of the needle260. Alternatively, in some embodiments, the needle 260 does notcomprise a female luer taper. In some embodiments, the needle 260 has agauge of 20 to 40. In some embodiments, the needle 260 has a gauge of 20to 22, 20 to 24, 20 to 26, 20 to 28, 20 to 30, 20 to 32, 20 to 34, 20 to36, 20 to 38, 20 to 40, 22 to 24, 22 to 26, 22 to 28, 22 to 30, 22 to32, 22 to 34, 22 to 36, 22 to 38, 22 to 40, 24 to 26, 24 to 28, 24 to30, 24 to 32, 24 to 34, 24 to 36, 24 to 38, 24 to 40, 26 to 28, 26 to30, 26 to 32, 26 to 34, 26 to 36, 26 to 38, 26 to 40, 28 to 30, 28 to32, 28 to 34, 28 to 36, 28 to 38, 28 to 40, 30 to 32, 30 to 34, 30 to36, 30 to 38, 30 to 40, 32 to 34, 32 to 36, 32 to 38, 32 to 40, 34 to36, 34 to 38, 34 to 40, 36 to 38, 36 to 40, or 38 to 40. In someembodiments, the needle 260 has a gauge of 20, 22, 24, 26, 28, 30, 32,34, 36, 38, or 40. In some embodiments, the needle 260 has a gauge of atleast 20, 22, 24, 26, 28, 30, 32, 34, 36, or 38. In some embodiments,the needle 260 has a gauge of at most 22, 24, 26, 28, 30, 32, 34, 36,38, or 40. In some embodiments, the needle 260 has a gauge of 23 to 30.In some embodiments, the needle 260 has a gauge of 23. In someembodiments, the needle 260 has a gauge of 30. In some embodiments, theneedle 260 is straight. In some embodiments, the needle 260 is curved.In some embodiments, the curved needle 260 has a curvature radius ofabout 10, 20, 30, 40, 50, 60, 70, 80, 90 mm or more. In someembodiments, the needle 260 is twisted. In some embodiments, the twistedneedle 260 has a pitch of about 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 mmor more. In some embodiments, the twisted needle 260 has a maximum outerdiameter of about 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 mm or more. Insome embodiments, the needle 260 is a commercially available needle 260.

As shown in FIGS. 4-6 the exemplary push pin 290 has a head and a pushrod. Further, as shown, the head is positioned proximally to the pushrod. As shown a proximal end of the needle 260 is coupled to the distalend of the needle housing 250 and the push pin 290 is disposed withinthe needle housing 250. Alternatively, in some embodiments, a proximalend of the needle 260 is within the needle housing 250. As shown, thepush rod of the push pin 290 has an outer diameter of less than theinner diameter of the thru-hole of the needle housing 250.

As shown in FIGS. 4-6 , the needle assembly 210 further comprises aresilient member 280 disposed within the needle housing 250. In someembodiments, the resilient member 280 proximally biases the push pin290. In some embodiments, the resilient member 280 proximally biases thepush pin 290 when the needle assembly 210 is in a sheathed state. Insome embodiments, the resilient member 280 proximally biases the pushpin 290 when the needle assembly 210 is in an unsheathed state. Asshown, the resilient member 280 is a spring. Alternatively, in someembodiments, the resilient member 280 is a flexure, a piston, a motor, aband, or any combination thereof. In some embodiments, the resilientmember 280 is disposed within and constrained by the first cavity of theneedle housing 250. In some embodiments, the resilient member 280 has anouter diameter of less than an inner diameter of the first cavity of theneedle housing 250. As shown, the push rod of the push pin 290 has anouter diameter of less than an inner diameter of the resilient member280.

As shown in FIGS. 4-6 , the needle assembly 210 further comprises aneedle sheath 270 surrounding at least a portion of the needle housing250, and having a distal portion surrounding the distal end of theneedle 260. In some embodiments, a proximal portion of the needle sheath270 surrounds the distal end of the needle housing 250. In someembodiments, a distal face of the needle sheath 270 is more distal tothe needle housing 250 in the sheathed state of the needle assembly 210than in the unsheathed state of the needle assembly 210. In someembodiments, a distal face of the needle sheath 270 is more distal tothe plunger housing 120 in the sheathed state of the needle assembly 210than in the unsheathed state of the needle assembly 210.

In some embodiments, when the needle assembly 210 is sheathed, theneedle 260 is entirely surrounded by the needle sheath 270. In someembodiments, when the needle assembly 210 is in the unsheathed state, atleast a portion of the needle 260 extends distally beyond the needlesheath 270. In some embodiments, the distal portion of the needle sheath270 abuts the eye of the patient when the implant is ejected from theneedle lumen. In some embodiments, the distal portion of the needlesheath 270 abuts the eye of the patient when the needle assembly 210 isin its sheathed state. In some embodiments, the distal portion of theneedle sheath 270 abuts the eye of the patient when the needle assembly210 is in its unsheathed state. In some embodiments, the distal portionof the needle sheath 270 abuts the eye of the patient when the needlelumen is within the eye of the patient. In some embodiments, the distalportion of the needle sheath 270 abuts the eye of the patient when theneedle lumen is within the needle sheath 270. In some embodiments, theneedle sheath 270 is removable from the needle housing 250. In someembodiments, the needle sheath 270 is removable from the needle housing250 by translation of the needle sheath 270 in a distal direction withrespect to the needle housing 250. In some embodiments, the needlesheath 270 is removable from the needle housing 250 by translation ofthe needle sheath 270 in a proximal direction with respect to the needlehousing 250.

As shown in FIGS. 4-6 , the first injector system 100 further comprisesa needle seal 271 at the distal end of the needle 260 that seals thedistal end of the needle lumen. In some embodiments, the needle seal 271is within a distal portion of the needle sheath 270. In someembodiments, the needle seal 271 is molded within a distal portion ofthe needle sheath 270. In some embodiments, the needle seal 271 isadhered or coupled to a distal portion of the needle sheath 270. In someembodiments, the needle seal 271 is formed of a polymer. In someembodiments, the polymer is rubber, plastic, or both. In someembodiments, the needle seal 271 is removable. In some embodiments,translating the needle sheath 270 in a proximal direction causes theneedle 260 to pierce the needle seal 271.

As shown in FIGS. 4-6 , the first injector system 100 further comprisesa collar 240, a push pin housing 230, and a collar sleeve 220. Further,as shown the collar sleeve 220 couples to the needle housing 250. Asshown some embodiments, the collar sleeve 220 couples to the needlehousing 250 by a snap. Alternatively, in some embodiments, the collarsleeve 220 couples to the needle housing 250 via a clip, a magnet, ascrew, a bolt, a nut, an adhesive, or any combination thereof. Further,as shown the push pin housing 230 couples to the needle housing 250 by asnap, a clip, a magnet, a screw, a bolt, a nut, an adhesive, or anycombination thereof. As shown a distal outer diameter of the push pinhousing 230 is less than an inner diameter of the second cavity of theneedle housing 250. Also as shown, the push pin housing 230 comprises achamfered thru-hole receiving a portion of the head of the push pin 290to maintain alignment of the push pin 290 as it travels distally andproximally. Further, the chamfered thru-hole receives a portion of thedistal end of the plunger 130, wherein the chamfer maintains alignmentof the distal end of the plunger 130 against the head of the push pin290. In some embodiments, the plunger 130 comprises a first plungerouter diameter and a second plunger outer diameter distal to the firstplunger outer diameter, wherein the second plunger outer diameter issmaller than the first plunger outer diameter. In some embodiments, thefirst plunger outer diameter is larger than the inner diameter of thechamfered thru-hole in the push pin housing 230. In some embodiments,the second plunger outer diameter is smaller than the inner diameter ofthe chamfered thru-hole in the push pin housing 230.

As shown, the collar 240 couples to the collar sleeve 220. In someembodiments, the collar 240, when coupled to the collar sleeve 220,prevents the needle sheath 270 from translating in a distal direction, aproximal direction or both. In some embodiments, the collar 240, whendecoupled from the collar sleeve 220, allows the needle sheath 270 totranslate in a distal direction, a proximal direction or both. In someembodiments, the needle assembly 210 is in a sheathed state, per FIG. 4, when the collar 240 is coupled to the collar sleeve 220. In someembodiments, the needle assembly 210 is in an unsheathed state, per FIG.5 , when the collar 240 is decoupled from the collar sleeve 220. In someembodiments, the collar 240 couples to the collar sleeve 220 by rotatingthe collar 240, translating the collar 240, or both with respect to thecollar sleeve 220. In some embodiments, the collar 240 decouples fromthe collar sleeve 220 by rotating the collar 240, translating the collar240, or both with respect to the collar sleeve 220. Further, as shown,the collar 240 comprises a tab to enable rotation of the collar 240,translation of the collar 240, or both with respect to the collar sleeve220.

As shown in FIGS. 4-6 , at least one of the push pin 290, the needlehousing 250 and the needle 260 is dimensioned such that translating thepush pin 290 in a distal direction ejects the implant positioned insidethe needle lumen out of the needle lumen and into the eye of thepatient. In some embodiments, at least one of the push pin 290, theneedle housing 250 and the needle 260 is dimensioned such thattranslating the push pin 290 in a distal direction partially ejects theimplant out of the needle lumen. In some embodiments, at least one ofthe push pin 290, the needle housing 250 and the needle 260 isdimensioned such that translating the push pin 290 in a distal directioncompletely ejects the implant out of the needle lumen. In someembodiments, at least one of the push pin 290, the needle housing 250and the needle 260 is dimensioned such that translating the push pin 290in a distal direction completely ejects the implant out of the needlelumen by about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm. In some embodiments,at least one of the push pin 290, the needle housing 250 and the needle260 is dimensioned such that translating the push pin 290 in a distaldirection completely ejects the implant out of the needle lumen by atleast about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm. In some embodiments, atleast one of the push pin 290, the needle housing 250 and the needle 260is dimensioned such that translating the push pin 290 in a distaldirection completely ejects the implant out of the needle lumen by atmost about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm.

In some embodiments, at least one of the push pin 290, the needlehousing 250, and the needle 260 is dimensioned such that translating thepush pin 290 in a distal direction positions a distal end of the pushrod of the push pin 290 distal to the distal end of the needle 260. Insome embodiments, at least one of the push pin 290, the needle housing250, and the needle 260 is dimensioned such that translating the pushpin 290 in a distal direction positions a distal end of the push rod ofthe push pin 290 distal to the distal end of the needle 260 by about 1,2, 3, 4, 5, 6, 7, 8, 9, or 10 mm. In some embodiments, at least one ofthe push pin 290, the needle housing 250, and the needle 260 isdimensioned such that translating the push pin 290 in a distal directionpositions a distal end of the push rod of the push pin 290 distal to thedistal end of the needle 260 by at least about 1, 2, 3, 4, 5, 6, 7, 8,9, or 10 mm. In some embodiments, at least one of the push pin 290, theneedle housing 250, and the needle 260 is dimensioned such thattranslating the push pin 290 in a distal direction positions a distalend of the push rod of the push pin 290 distal to the distal end of theneedle 260 by at most about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm. In someembodiments, at least one of the push pin 290, the needle housing 250and the needle 260 is dimensioned such that translating the push pin 290in a distal direction positions a distal end of the push rod of the pushpin 290 proximal to the distal end of the needle 260. In someembodiments, at least one of the push pin 290, the needle housing 250and the needle 260 is dimensioned such that translating the push pin 290in a distal direction positions a distal end of the push rod of the pushpin 290 proximal to the distal end of the needle 260 by about 1, 2, 3,4, 5, 6, 7, 8, 9, or 10 mm. In some embodiments, at least one of thepush pin 290, the needle housing 250 and the needle 260 is dimensionedsuch that translating the push pin 290 in a distal direction positions adistal end of the push rod of the push pin 290 proximal to the distalend of the needle 260 by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10mm. In some embodiments, at least one of the push pin 290, the needlehousing 250 and the needle 260 is dimensioned such that translating thepush pin 290 in a distal direction positions a distal end of the pushrod of the push pin 290 proximal to the distal end of the needle 260 byat most about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm.

In some embodiments, at least one of the push pin 290, the needlehousing 250, or the needle 260 is dimensioned such that applying anactuating force on the push pin 290 in a distal direction positions adistal end of the push rod of the push pin 290 distal to the distal endof the needle 260. In some embodiments, the push pin 290 retracts withinthe needle 260 after the actuating force is removed. In someembodiments, the push pin 290 retracts within the needle 260 by adistance of at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm. In someembodiments, the push pin 290 retracts within the needle 260 by adistance of at most about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm. In someembodiments, the push pin 290 retracts within the needle 260 by adistance of 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm from the distal face ofthe needle 260 after the actuating force is removed.

In some embodiments, the needle 260 has a length such that the distalend of the needle 260 is within the needle seal when the needle assembly210 is in a sheathed state. Further, as shown, at least a portion of thepush rod of the push pin 290 is disposed within the needle 260, and atleast a portion of the push pin 290 is disposed within the needlehousing 250. As shown a distal portion of the push pin 290 is disposedwithin the needle 260, and a proximal portion of the push pin 290 isdisposed within the needle housing 250. Further, as shown, at a proximalportion of the push pin 290 is disposed within the second cavity of theneedle housing 250, an intermediate portion of the push pin 290 isdisposed within the first cavity of the needle housing 250, and the pushpin 290 passes through the thru-hole of the needle housing 250. Asshown, a distal end of the needle 260 extends beyond the distal end ofthe needle housing 250. In some embodiments, a distal end of the needle260 extends beyond the distal end of the needle housing 250 by about 1,2, 3, 4, 5, 6, 7, 8, 9, or 10 mm or more. In some embodiments, a distalend of the needle 260 extends beyond the distal end of the needlehousing 250 by at least about 1, 2, 3, 4, 5, 6, 7, 8, 9, or 10 mm. Insome embodiments, a distal end of the needle 260 extends beyond thedistal end of the needle housing 250 by at most about 1, 2, 3, 4, 5, 6,7, 8, 9, or 10 mm.

As shown, the push rod of the push pin 290 translates within the needlelumen. Further as shown, the push rod has an outer diameter of less thanthe inner diameter of the needle 260. Alternatively, in someembodiments, the head has an outer diameter greater than the innerdiameter of the needle 260. In some embodiments, the head does not fitwithin the needle 260. In some embodiments, at least a portion of thehead does not fit within the needle 260. In some embodiments, the pushpin 290 is dimensioned and positioned in the needle lumen such thatdistal translating of the push pin 290 pushes the implant positionedinside the needle lumen. In some embodiments, the push pin 290 isdimensioned and positioned in the needle lumen such that distaltranslating of the push pin 290 pushes the implant positioned inside theneedle lumen to out of the needle lumen. In some embodiments, the pushpin 290 is dimensioned and positioned in the needle lumen such thatdistal translating of the push pin 290 pushes the implant positionedinside the needle lumen to out of the needle lumen into the eye of thepatient. In some embodiments, a distal surface of the push rod of thepush pin 290 contacts the distal portion of the implant during theextended position, the retracted position, or both of the plungerassembly 200.

In some embodiments, the implant has a shape of elongated cylinder. Insome embodiments, the implant comprises a plurality of particles. Insome embodiments, the implant has a cross sectional shape of a circle, atriangle, a square, a rectangle, or any other polygon.

In some embodiments, the needle 260 has a length such that the distalend of the needle 260 is within the needle seal when the needle assembly210 is in the sheathed state. In some embodiments, the needle 260 has alength of about 5 mm to about 70 mm. In some embodiments, the needle 260has a length of about 5 mm to about 10 mm, about 5 mm to about 15 mm,about 5 mm to about 20 mm, about 5 mm to about 25 mm, about 5 mm toabout 30 mm, about 5 mm to about 35 mm, about 5 mm to about 40 mm, about5 mm to about 45 mm, about 5 mm to about 50 mm, about 5 mm to about 60mm, about 5 mm to about 70 mm, about 10 mm to about 15 mm, about 10 mmto about 20 mm, about 10 mm to about 25 mm, about 10 mm to about 30 mm,about 10 mm to about 35 mm, about 10 mm to about 40 mm, about 10 mm toabout 45 mm, about 10 mm to about 50 mm, about 10 mm to about 60 mm,about 10 mm to about 70 mm, about 15 mm to about 20 mm, about 15 mm toabout 25 mm, about 15 mm to about 30 mm, about 15 mm to about 35 mm,about 15 mm to about 40 mm, about 15 mm to about 45 mm, about 15 mm toabout 50 mm, about 15 mm to about 60 mm, about 15 mm to about 70 mm,about 20 mm to about 25 mm, about 20 mm to about 30 mm, about 20 mm toabout 35 mm, about 20 mm to about 40 mm, about 20 mm to about 45 mm,about 20 mm to about 50 mm, about 20 mm to about 60 mm, about 20 mm toabout 70 mm, about 25 mm to about 30 mm, about 25 mm to about 35 mm,about 25 mm to about 40 mm, about 25 mm to about 45 mm, about 25 mm toabout 50 mm, about 25 mm to about 60 mm, about 25 mm to about 70 mm,about 30 mm to about 35 mm, about 30 mm to about 40 mm, about 30 mm toabout 45 mm, about 30 mm to about 50 mm, about 30 mm to about 60 mm,about 30 mm to about 70 mm, about 35 mm to about 40 mm, about 35 mm toabout 45 mm, about 35 mm to about 50 mm, about 35 mm to about 60 mm,about 35 mm to about 70 mm, about 40 mm to about 45 mm, about 40 mm toabout 50 mm, about 40 mm to about 60 mm, about 40 mm to about 70 mm,about 45 mm to about 50 mm, about 45 mm to about 60 mm, about 45 mm toabout 70 mm, about 50 mm to about 60 mm, about 50 mm to about 70 mm, orabout 60 mm to about 70 mm. In some embodiments, the needle 260 has alength of about 5 mm, about 10 mm, about 15 mm, about 20 mm, about 25mm, about 30 mm, about 35 mm, about 40 mm, about 45 mm, about 50 mm,about 60 mm, or about 70 mm. In some embodiments, the needle 260 has alength of at least about 5 mm, about 10 mm, about 15 mm, about 20 mm,about 25 mm, about 30 mm, about 35 mm, about 40 mm, about 45 mm, about50 mm, or about 60 mm. In some embodiments, the needle 260 has a lengthof at most about 10 mm, about 15 mm, about 20 mm, about 25 mm, about 30mm, about 35 mm, about 40 mm, about 45 mm, about 50 mm, about 60 mm, orabout 70 mm. In some embodiments, the length of the needle 260 is amaximum length, a minimum length, a normal length, or an average length.

As shown in FIGS. 4, 5, and 7 the injector system 100 comprises aplunger housing 120, a plunger 130, and a compression spring 140. Asshown, the plunger 130 is slidably disposed within the plunger housing120. Further, as shown, a distal end of the plunger 130 is adapted toengage and push the push pin 290 of the needle assembly 210 when in adistal position within the plunger housing 120.

In some embodiments, the distal end of the plunger 130 engages the headof the push pin 290 of the needle assembly 210. In some embodiments, theplunger 130 is manually actuated to translate distally within theplunger housing 120. In some embodiments, the plunger housing 120 is asyringe barrel. In some embodiments, the syringe barrel is a 1 mLsyringe barrel. In some embodiments, a proximal end of the syringeplunger 130 protrudes beyond the plunger housing 120. In someembodiments, the plunger 130 is mechanically actuated to translatedistally within the plunger housing 120. In some embodiments, theplunger assembly 110 further comprises a compression spring 140 biasingthe plunger 130 towards a proximal end of the plunger housing 120. Insome embodiments, the compression spring 140 has a distal end connectedto the plunger housing 120 and a proximal end connected to the plunger130. In some embodiments, per FIG. 19 , the plunger housing 120 is abiopsy punch.

In some embodiments, the plunger 130 comprises a first stop feature 131,wherein the plunger housing 120 comprises a second stop 121 122 featureengageable with the first stop feature 131. In some embodiments, thesecond stop feature comprises a primary second stop 121 and a secondarysecond stop 122. In some embodiments, the first stop feature 131 engageswith the primary second stop 121 in the retracted position of theplunger assembly 110. In some embodiments, the first stop feature 131engages with the secondary second stop 122 in the extended position ofthe plunger assembly 110. In some embodiments, the first stop feature131 engages with the secondary second stop 122 only in the unsheathedstate of the needle assembly 210. In some embodiments, the first stopfeature 131 engages with the secondary second stop 122 in the extendedposition of the plunger assembly 110, wherein upon implantation, distalforce on the plunger advances the first stop feature 131 past thesecondary second stop 122 by a retraction distance, whereafter reductionor release of the distal force returns the first stop feature 131proximally by the retraction distance to engage with the secondarysecond stop 122. As shown, the first stop feature 131 comprises aflexure, wherein the primary second stop 121 and the secondary secondstop 122 comprise a slot. Alternatively, the first stop feature 131comprises a snap, a detent, a spring, a clip, or any combinationthereof. Alternatively, at least one of the primary second stop 121 andthe secondary second stop 122 comprise a snap, a detent, a spring, aclip, or any combination thereof. Further as shown, the secondary secondstop 122 is distal to the primary second stop 121. In some embodiments,a distance between the primary second stop 121 and the secondary secondstop 122 determines the distance that the plunger 130 translates fromthe extended position to the retracted position. In some embodiments, adistance between the primary second stop 121 and the secondary secondstop 122 determines the distance that the push pin 290 translates. Insome embodiments, a distance between the primary second stop 121 and thesecondary second stop 122 determines the distance that the implanttranslates. In some embodiments, a distance between the primary secondstop 121 and the secondary second stop 122 minus the length of theimplant determines the distance that the implant is deposited into theeye of a subject.

As shown in FIGS. 4 and 5 , the plunger 130 comprises a first plungerouter diameter and a second plunger outer diameter distal to the firstplunger outer diameter, wherein the second plunger outer diameter issmaller than the first plunger outer diameter. In some embodiments, thefirst plunger outer diameter is larger than the inner diameter of thechamfered thru-hole in the push pin housing 230. In some embodiments,the second plunger outer diameter is smaller than the inner diameter ofthe chamfered thru-hole in the push pin housing 230.

Second Injector System

Provided herein per FIGS. 8-15 is a second injector system 800 forinjecting an implant into an eye of a patient, the system comprising aneedle assembly 910 and a plunger assembly 810. As shown, the needleassembly 910 removably couples to a distal end of the plunger assembly810. In some embodiments, the needle assembly 910 removably couples to adistal end of the plunger assembly 810 by a snap, a screw, a pin, aband, a clamp, or any combination thereof. Alternatively, in someembodiments, the needle assembly 910 permanently couples to the plungerassembly 810. In some embodiments, the needle assembly 910 ismaneuverable between a sheathed state and an unsheathed state. FIG. 8shows a sheathed state of the needle assembly 910, and FIG. 2 shows anunsheathed state of the needle assembly 910. In some embodiments, theplunger assembly 810 is maneuverable between an extended position and aretracted position.

As seen per FIGS. 10, 11, 14, and 15 the exemplary needle assembly 910comprises a needle housing 950, a needle 960, and a push pin 990. Insome embodiments, the needle assembly 910 further comprises the implantloaded in the needle 960. In some embodiments, the needle assembly 910further comprises the implant loaded in a lumen of the needle 960.

As shown, the needle housing 950 has a proximal end and a distal end.Further, as shown, the needle housing 950 comprises a male luer taper, athru-hole, a first cavity, and a second cavity. Alternatively, in someembodiments, the needle housing 950 does not comprise one or more of themale luer taper, the thru-hole, the first cavity, and the second cavity.In some embodiments, two or more of the male luer taper, the thru-hole,the first cavity, and the second cavity are concentric. As shown, adistal termination of the first cavity is distal to the distaltermination of the male luer taper. As shown, a proximal termination ofthe first cavity is distal to the distal termination of the male luertaper.

As shown, the needle 960 comprises a needle lumen at the distal end ofthe needle 960 and a female luer taper at the proximal end of the needle960. In some embodiments, the needle 960 has a gauge of 90 to 40. Insome embodiments, the needle 960 has a gauge of 90 to 92, 90 to 94, 90to 96, 90 to 98, 90 to 30, 90 to 32, 90 to 34, 90 to 36, 90 to 38, 90 to40, 92 to 94, 92 to 96, 92 to 98, 92 to 30, 92 to 32, 92 to 34, 92 to36, 92 to 38, 92 to 40, 94 to 96, 94 to 98, 94 to 30, 94 to 32, 94 to34, 94 to 36, 94 to 38, 94 to 40, 96 to 98, 96 to 30, 96 to 32, 96 to34, 96 to 36, 96 to 38, 96 to 40, 98 to 30, 98 to 32, 98 to 34, 98 to36, 98 to 38, 98 to 40, 30 to 32, 30 to 34, 30 to 36, 30 to 38, 30 to40, 32 to 34, 32 to 36, 32 to 38, 32 to 40, 34 to 36, 34 to 38, 34 to40, 36 to 38, 36 to 40, or 38 to 40. In some embodiments, the needle 960has a gauge of 90, 92, 94, 96, 98, 30, 32, 34, 36, 38, or 40. In someembodiments, the needle 960 has a gauge of at least 90, 92, 94, 96, 98,30, 32, 34, 36, or 38. In some embodiments, the needle 960 has a gaugeof at most 92, 94, 96, 98, 30, 32, 34, 36, 38, or 40. In someembodiments, the needle 960 has a gauge of 93 to 30. In someembodiments, the needle 960 has a gauge of 93. In some embodiments, theneedle 960 has a gauge of 30. In some embodiments, the needle 960 isstraight. In some embodiments, the needle 960 is curved. In someembodiments, the curved needle 960 has a curvature radius of about 80,90, 30, 40, 50, 60, 70, 80, 90 mm or more. In some embodiments, theneedle 960 is twisted. In some embodiments, the twisted needle 960 has apitch of about 5, 80, 85, 90, 95, 30, 35, 40, 45, 50 mm or more. In someembodiments, the twisted needle 960 has a maximum outer diameter ofabout 5, 80, 85, 90, 95, 30, 35, 40, 45, 50 mm or more. In someembodiments, the needle 960 is a commercially available needle.

As shown in FIGS. 10, 11, 14, and 15 the exemplary push pin 990 has ahead and a push rod. Further, as shown, the head is positionedproximally to the push rod. As shown a proximal end of the needle 960 iscoupled to the distal end of the needle housing 950 and the push pin 990is disposed within the needle housing 950. Alternatively, in someembodiments, a proximal end of the needle 960 is within the needlehousing 950. As shown, the push rod of the push pin 990 has an outerdiameter of less than the inner diameter of the thru-hole of the needlehousing 950.

As shown in FIGS. 10, 11, 14, and 15 , the needle assembly 910 furthercomprises a resilient member 980 disposed within the needle housing 950.In some embodiments, the resilient member 980 proximally biases the pushpin 990. In some embodiments, the resilient member 980 proximally biasesthe push pin 990 when the needle assembly 910 is in a sheathed state. Insome embodiments, the resilient member 980 proximally biases the pushpin 990 when the needle assembly 910 is in an unsheathed state. Asshown, the resilient member 980 is a spring. Alternatively, in someembodiments, the resilient member 980 is a flexure, a piston, a motor, aband, or any combination thereof. In some embodiments, the resilientmember 980 is disposed within and constrained by the first cavity of theneedle housing 950. In some embodiments, the resilient member 980 has anouter diameter of less than an inner diameter of the first cavity of theneedle housing 950. As shown, the push rod of the push pin 990 has anouter diameter of less than an inner diameter of the resilient member980.

As shown in FIGS. 10, 11, 14, and 15 , the needle assembly 910 furthercomprises a needle sheath 970 surrounding at least a portion of theneedle housing 950, and having a distal portion surrounding the distalend of the needle 960. In some embodiments, a proximal portion of theneedle sheath 970 surrounds the distal end of the needle housing 950. Insome embodiments, a distal face of the needle sheath 970 is more distalto the needle housing 950 in the sheathed state of the needle assembly910 than in the unsheathed state of the needle assembly 910. In someembodiments, a distal face of the needle sheath 970 is more distal tothe plunger housing 120 in the sheathed state of the needle assembly 910than in the unsheathed state of the needle assembly 910.

In some embodiments, when the needle assembly 910 is the sheathed, theneedle 960 is entirely surrounded by the needle sheath 970. In someembodiments, when the needle assembly 910 is in the unsheathed state, atleast a portion of the needle 960 extends distally beyond the needlesheath 970. In some embodiments, the distal portion of the needle sheath970 abuts the eye of the patient when the implant is ejected from theneedle lumen. In some embodiments, the distal portion of the needlesheath 970 abuts the eye of the patient when the needle assembly 910 isin its sheathed state. In some embodiments, the distal portion of theneedle sheath 970 abuts the eye of the patient when the needle assembly910 is in its unsheathed state. In some embodiments, the distal portionof the needle sheath 970 abuts the eye of the patient when the needlelumen is within the eye of the patient. In some embodiments, the distalportion of the needle sheath 970 abuts the eye of the patient when theneedle lumen is within the needle sheath 970. In some embodiments, theneedle sheath 970 is removable from the needle housing 950. In someembodiments, the needle sheath 970 is removable from the needle housing950 by translation of the needle sheath 970 in a distal direction withrespect to the needle housing 950. In some embodiments, the needlesheath 970 is removable from the needle housing 950 by translation ofthe needle sheath 970 in a proximal direction with respect to the needlehousing 950.

As shown in FIGS. 10, 11, 14, and 15 , the second injector system 800further comprises a needle seal 971 at the distal end of the needle 960that seals the distal end of the needle lumen. In some embodiments, theneedle seal 971 is within a distal portion of the needle sheath 970. Insome embodiments, the needle seal 971 is molded within a distal portionof the needle sheath 970. In some embodiments, the needle seal 971 isadhered or coupled to a distal portion of the needle sheath 970. In someembodiments, the needle seal 971 is formed of a polymer. In someembodiments, the polymer is rubber, plastic, or both. In someembodiments, the needle seal 971 is removable. In some embodiments,translating the needle sheath 970 in a proximal direction causes theneedle 960 to pierce the needle seal 971.

As shown in FIGS. 10, 11, 14, and 15 , the second injector system 800further comprises a collar 940, a plunger attachment sleeve 930, and acollar sleeve 920. Further, as shown the collar sleeve 920 couples to atleast one of the needle housing 950, the plunger attachment sleeve 930,or the needle sheath 970. As shown some embodiments, the collar sleeve920 couples to the needle sheath 970 by a snap. Alternatively, in someembodiments, the collar sleeve 920 couples to the needle sheath 970 viaa clip, a magnet, a screw, a bolt, a nut, an adhesive, or anycombination thereof. Further, as shown the plunger attachment sleeve 930couples to the needle housing, the collar sleeve 920, or both by a snap.Alternatively, the plunger attachment sleeve 930 couples to the needlehousing, the collar sleeve 920, or both by a clip, a magnet, a screw, abolt, a nut, an adhesive, or any combination thereof. As shown a distalouter diameter of the plunger attachment sleeve 930 is greater than aninner diameter of the second cavity of the needle housing 950. Also asshown, the plunger attachment sleeve 930 removably connects to theplunger housing 820.

As shown, the collar 940 couples to the collar sleeve 920. In someembodiments, the collar 940, when coupled to the collar sleeve 920,prevents the needle sheath 970 from translating in a distal direction, aproximal direction or both. In some embodiments, the collar 940, whendecoupled from the collar sleeve 920, allows the needle sheath 970 totranslate in a distal direction, a proximal direction or both. In someembodiments, the needle assembly 910 is in a sheathed state, per FIG. 10, when the collar 940 is coupled to the collar sleeve 920. In someembodiments, the needle assembly 910 is in an unsheathed state, per FIG.11 , when the collar 940 is decoupled from the collar sleeve 920. Insome embodiments, the collar 940 couples to the collar sleeve 920 byrotating the collar 940, translating the collar 940, or both withrespect to the collar sleeve 920. In some embodiments, the collar 940decouples from the collar sleeve 920 by rotating the collar 940,translating the collar 940, or both with respect to the collar sleeve920.

As shown in FIGS. 10, 11, 14, and 15 , at least one of the push pin 990,the needle housing 950 and the needle 960 is dimensioned such thattranslating the push pin 990 in a distal direction ejects the implantpositioned inside the needle lumen out of the needle lumen and into theeye of the patient. In some embodiments, at least one of the push pin990, the needle housing 950 and the needle 960 is dimensioned such thattranslating the push pin 990 in a distal direction partially ejects theimplant out of the needle lumen. In some embodiments, at least one ofthe push pin 990, the needle housing 950 and the needle 960 isdimensioned such that translating the push pin 990 in a distal directioncompletely ejects the implant out of the needle lumen. In someembodiments, at least one of the push pin 990, the needle housing 950and the needle 960 is dimensioned such that translating the push pin 990in a distal direction completely ejects the implant out of the needlelumen by 8, 9, 3, 4, 5, 6, 7, 8, 9, 80 mm or more.

In some embodiments, at least one of the push pin 990, the needlehousing 950, and the needle 960 is dimensioned such that translating thepush pin 990 in a distal direction positions a distal end of the pushrod of the push pin 990 distal to the distal end of the needle 960. Insome embodiments, at least one of the push pin 990, the needle housing950, and the needle 960 is dimensioned such that translating the pushpin 990 in a distal direction positions a distal end of the push rod ofthe push pin 990 distal to the distal end of the needle 960 by 8, 9, 3,4, 5, 6, 7, 8, 9, 80 mm or more. In some embodiments, at least one ofthe push pin 990, the needle housing 950 and the needle 960 isdimensioned such that translating the push pin 990 in a distal directionpositions a distal end of the push rod of the push pin 990 proximal tothe distal end of the needle 960. In some embodiments, at least one ofthe push pin 990, the needle housing 950 and the needle 960 isdimensioned such that translating the push pin 990 in a distal directionpositions a distal end of the push rod of the push pin 990 proximal tothe distal end of the needle 960 by 8, 9, 3, 4, 5, 6, 7, 8, 9, 80 mm ormore.

In some embodiments, the needle 960 has a length such that the distalend of the needle 960 is within the needle seal when the needle assembly910 is in a sheathed state. Further, as shown, at least a portion of thepush rod of the push pin 990 is disposed within the needle 960, and atleast a portion of the push pin 990 is disposed within the needlehousing 950. As shown a distal portion of the push pin 990 is disposedwithin the needle 960, and a proximal portion of the push pin 990 isdisposed within the needle housing 950. Further, as shown, a proximalportion of the push pin 990 is disposed within the second cavity of theneedle housing 950, an intermediate portion of the push pin 990 isdisposed within the first cavity of the needle housing 950, and the pushpin 990 passes through the thru-hole of the needle housing 950. Asshown, a distal end of the needle 960 extends beyond the distal end ofthe needle housing 950. In some embodiments, a distal end of the needle960 extends beyond the distal end of the needle housing 950 by 8, 9, 3,4, 5, 6, 7, 8, 9, 80 mm or more.

As shown, the push rod of the push pin 990 translates within the needlelumen. Further as shown, the push rod has an outer diameter of less thanthe inner diameter of the needle 960. Alternatively, in someembodiments, the head has an outer diameter greater than the innerdiameter of the needle 960. In some embodiments, the head does not fitwithin the needle 960. In some embodiments, the push pin 990 isdimensioned and positioned in the needle lumen such that distaltranslating of the push pin 990 pushes the implant positioned inside theneedle lumen. In some embodiments, the push pin 990 is dimensioned andpositioned in the needle lumen such that distal translating of the pushpin 990 pushes the implant positioned inside the needle lumen to out ofthe needle lumen. In some embodiments, the push pin 990 is dimensionedand positioned in the needle lumen such that distal translating of thepush pin 990 pushes the implant positioned inside the needle lumen toout of the needle lumen into the eye of the patient. In someembodiments, a distal surface of the push rod of the push pin 990contacts the distal portion of the implant during the sheathed state,the unsheathed state, or both of the needle assembly 910. In someembodiments, a distal surface of the push rod of the push pin 990contacts the distal portion of the implant during a sheathed state ofthe device, an unsheathed state of the device, or both of the needleassembly 910.

In some embodiments, the implant has a shape of elongated cylinder. Insome embodiments, the implant comprises a plurality of particles. Insome embodiments, the implant has a cross sectional shape of a circle, atriangle, a square, a rectangle, or any other polygon.

In some embodiments, the needle 960 has a length such that the distalend of the needle 960 is within the needle seal when the needle assembly910 is in a sheathed state. In some embodiments, the needle 960 has alength of about 5 mm to about 70 mm. In some embodiments, the needle 960has a length of about 5 mm to about 80 mm, about 5 mm to about 85 mm,about 5 mm to about 90 mm, about 5 mm to about 95 mm, about 5 mm toabout 30 mm, about 5 mm to about 35 mm, about 5 mm to about 40 mm, about5 mm to about 45 mm, about 5 mm to about 50 mm, about 5 mm to about 60mm, about 5 mm to about 70 mm, about 80 mm to about 85 mm, about 80 mmto about 90 mm, about 80 mm to about 95 mm, about 80 mm to about 30 mm,about 80 mm to about 35 mm, about 80 mm to about 40 mm, about 80 mm toabout 45 mm, about 80 mm to about 50 mm, about 80 mm to about 60 mm,about 80 mm to about 70 mm, about 85 mm to about 90 mm, about 85 mm toabout 95 mm, about 85 mm to about 30 mm, about 85 mm to about 35 mm,about 85 mm to about 40 mm, about 85 mm to about 45 mm, about 85 mm toabout 50 mm, about 85 mm to about 60 mm, about 85 mm to about 70 mm,about 90 mm to about 95 mm, about 90 mm to about 30 mm, about 90 mm toabout 35 mm, about 90 mm to about 40 mm, about 90 mm to about 45 mm,about 90 mm to about 50 mm, about 90 mm to about 60 mm, about 90 mm toabout 70 mm, about 95 mm to about 30 mm, about 95 mm to about 35 mm,about 95 mm to about 40 mm, about 95 mm to about 45 mm, about 95 mm toabout 50 mm, about 95 mm to about 60 mm, about 95 mm to about 70 mm,about 30 mm to about 35 mm, about 30 mm to about 40 mm, about 30 mm toabout 45 mm, about 30 mm to about 50 mm, about 30 mm to about 60 mm,about 30 mm to about 70 mm, about 35 mm to about 40 mm, about 35 mm toabout 45 mm, about 35 mm to about 50 mm, about 35 mm to about 60 mm,about 35 mm to about 70 mm, about 40 mm to about 45 mm, about 40 mm toabout 50 mm, about 40 mm to about 60 mm, about 40 mm to about 70 mm,about 45 mm to about 50 mm, about 45 mm to about 60 mm, about 45 mm toabout 70 mm, about 50 mm to about 60 mm, about 50 mm to about 70 mm, orabout 60 mm to about 70 mm. In some embodiments, the needle 960 has alength of about 5 mm, about 80 mm, about 85 mm, about 90 mm, about 95mm, about 30 mm, about 35 mm, about 40 mm, about 45 mm, about 50 mm,about 60 mm, or about 70 mm. In some embodiments, the needle 960 has alength of at least about 5 mm, about 80 mm, about 85 mm, about 90 mm,about 95 mm, about 30 mm, about 35 mm, about 40 mm, about 45 mm, about50 mm, or about 60 mm. In some embodiments, the needle 960 has a lengthof at most about 80 mm, about 85 mm, about 90 mm, about 95 mm, about 30mm, about 35 mm, about 40 mm, about 45 mm, about 50 mm, about 60 mm, orabout 70 mm. In some embodiments, the length of the needle 960 is amaximum length, a minimum length, a normal length, or an average length.

As shown in FIGS. 10-13 the second injector system 800 comprises aplunger housing 820, a plunger 830, and a compression spring 840. Asshown, the plunger 830 is slidably disposed within the plunger housing820. Further, as shown, a distal end of the plunger 830 is adapted toengage and push the push pin 990 of the needle assembly 910 when in adistal position within the plunger housing 820.

In some embodiments, the distal end of the plunger 830 engages the headof the push pin 990 of the needle assembly 910. In some embodiments, theplunger 830 is manually actuated to translate distally within theplunger housing 820. In some embodiments, the plunger housing 820 is asyringe barrel. In some embodiments, the syringe barrel is a 1 mLsyringe barrel. In some embodiments, a proximal end of the syringeplunger 830 protrudes beyond the plunger housing 820. In someembodiments, the plunger 830 is mechanically actuated to translatedistally within the plunger housing 820. In some embodiments, theplunger assembly 810 further comprises a compression spring 840 biasingthe plunger 830 towards a proximal end of the plunger housing 820. Insome embodiments, the compression spring 840 has a distal end connectedto the plunger housing 820 and a proximal end connected to the plunger830.

In some embodiments, the plunger 830 comprises a first stop feature 831,wherein the plunger housing 820 comprises a second stop 821 822 featureengageable with the first stop feature 831. In some embodiments, thesecond stop feature comprises a primary second stop 821 and a secondarysecond stop 822. In some embodiments, the primary second stop 821engages with the first stop feature 831 in the sheathed state of theneedle assembly 910. In some embodiments, the secondary second stop 822engages with the first stop feature 831 in the unsheathed state of theneedle assembly 910. In some embodiments, the primary second stop 821engages with the first stop feature 831 in the sheathed state of theneedle assembly 910, wherein upon implantation, distal force on theplunger advances the first stop feature 831 past the secondary secondstop 822 by a retraction distance, whereafter reduction or release ofthe distal force returns the first stop feature 831 proximally by theretraction distance to engage with the secondary second stop 822. Asshown, the first stop feature 831 comprises a flexure, wherein theprimary second stop 821 and the secondary second stop 822 comprise aslot. Alternatively, the first stop feature 831 comprises a snap, adetent, a spring, a clip, or any combination thereof. Alternatively, atleast one of the primary second stop 821 and the secondary second stop822 comprise a snap, a detent, a spring, a clip, or any combinationthereof. Further as shown, the secondary second stop 822 is distal tothe primary second stop 821. In some embodiments, a distance between theprimary second stop 821 and the secondary second stop 822 determines thedistance that the plunger translates from the sheathed state to theunsheathed state of the needle assembly 910. In some embodiments, adistance between the primary second stop 821 and the secondary secondstop 822 determines the distance that the push pin 990 translates. Insome embodiments, a distance between the primary second stop 821 and thesecondary second stop 822 determines the distance that the implanttranslates. In some embodiments, a distance between the primary secondstop 821 and the secondary second stop 822 minus the length of theimplant determines the distance that the implant is deposited into theeye of a subject.

Additional Injector Systems

FIGS. 16-19 show illustrations of an exemplary injector system 1600comprising a biopsy punch 1610. In some embodiments, the biopsy punch1610 comprises a modified biopsy punch formed from a commerciallyavailable biopsy punch. In some embodiments, the biopsy punch injectorsystem 1600 comprises a commercially available needle 1620 and a sheath1670 surrounding at least a portion of the needle 1620. As shown in FIG.18 , the biopsy punch injector system 1600 comprises a push pin 1690coupled to a distal surface of the biopsy punch 1610. In someembodiments, an implantable medicament is contained within the needle1620. In some embodiments, distal translation of the biopsy punch 1610translates the push pin 1690 to eject an implantable medicament out ofthe needle 1620.

In some embodiments, the needle 1620 has a gauge of 20 to 40. In someembodiments, the needle 1620 has a gauge of 20 to 22, 20 to 24, 20 to26, 20 to 28, 20 to 30, 20 to 32, 20 to 34, 20 to 36, 20 to 38, 20 to40, 22 to 24, 22 to 26, 22 to 28, 22 to 30, 22 to 32, 22 to 34, 22 to36, 22 to 38, 22 to 40, 24 to 26, 24 to 28, 24 to 30, 24 to 32, 24 to34, 24 to 36, 24 to 38, 24 to 40, 26 to 28, 26 to 30, 26 to 32, 26 to34, 26 to 36, 26 to 38, 26 to 40, 28 to 30, 28 to 32, 28 to 34, 28 to36, 28 to 38, 28 to 40, 30 to 32, 30 to 34, 30 to 36, 30 to 38, 30 to40, 32 to 34, 32 to 36, 32 to 38, 32 to 40, 34 to 36, 34 to 38, 34 to40, 36 to 38, 36 to 40, or 38 to 40. In some embodiments, the needle1620 has a gauge of 20, 22, 24, 26, 28, 30, 32, 34, 36, 38, or 40. Insome embodiments, the needle 1620 has a gauge of at least 20, 22, 24,26, 28, 30, 32, 34, 36, or 38. In some embodiments, the needle 1620 hasa gauge of at most 22, 24, 26, 28, 30, 32, 34, 36, 38, or 40. In someembodiments, the needle 1620 has a gauge of 23 to 30. In someembodiments, the needle 1620 has a gauge of 23. In some embodiments, theneedle 1620 has a gauge of 30. In some embodiments, the needle 1620 isstraight. In some embodiments, the needle 1620 is curved. In someembodiments, the curved needle 1620 has a curvature radius of about 10,20, 30, 40, 50, 60, 70, 80, 90 mm or more. In some embodiments, theneedle 1620 is twisted. In some embodiments, the twisted needle 1620 hasa pitch of about 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 mm or more. Insome embodiments, the twisted needle 1620 has a maximum outer diameterof about 5, 10, 15, 20, 25, 30, 35, 40, 45, 50 mm or more.

FIG. 19 shows an exemplary injector system 1600 comprising a biopsypunch 1610 and a retractable needle seal housing 1650. As shown, theretractable needle seal housing 1650 is slidably coupled to the needle1620. Further as shown, the retractable needle seal housing 1650translates with respect to the needle 1620 between a sheathed state andan unsheathed state. Further, as shown the retractable needle sealhousing 1650 comprises a flange for manipulation of the system 1600, anda needle seal 1671. In some embodiments, the retractable needle sealhousing 1650 comprises a needle seal 1671 that surrounds the distal endof the needle 1620 when the system 1600 is in the sheathed state. Insome embodiments, the distal end of the needle 1620 is distal to thedistal face of the distal plug of the needle seal 1671 when the system1600 is in an unsheathed state. Additionally, as shown, the sheath 1670removably attaches to the retractable needle seal housing 1650. In someembodiments, the needle seal 1671 of the retractable needle seal housing1671 is made of silicone, plastic, or any other medical grade material.

FIGS. 20-24 show exemplary injector systems comprising a syringe 2010.Per FIG. 20 , the injector system 2000 comprises the syringe 2010, aneedle 1620, a sheath 1670 surrounding at least a portion of the needle1620, and a retractable needle seal 1670 slidably coupled to the needle1620. In some embodiments, the syringe 2010 comprises a 1 ml syringe. Insome embodiments, the syringe 2010 comprises a commercially availablesyringe. As shown injector system 2000 comprises a push pin 1690 coupledto a distal surface of the syringe 2010. In some embodiments, animplantable medicament is contained within the needle 1620. In someembodiments, distal translation of the syringe 2010 translates the pushpin 1690 to eject an implantable medicament out of the needle 1620. Asseen in FIG. 21 , in some embodiments, the sheath 1670 and theretractable needle seal 1671 of the injector system 2000 are a singleretainer sheath component 2150, which extends proximally beyond theneedle 1620. In some embodiments, the retainer sheath component 2150provides an airtight seal against the syringe 2010.

FIG. 22 shows illustrations of an exemplary injector system 2200comprising a needle 2260 and removable needle seal assembly 2250 in asheathed state (left) and an unsheathed state (right). As shown therein,the shape of the outer surface of the hub of the needle 2260 serves as arail. In some embodiments, the rail has longitudinal bearing surfacesparallel to the retraction direction of the removable needle sealassembly. In some embodiments, the longitudinal bearing surface iseither formed of ridges or has a cylindrical cross-sectional shape. Insome embodiments, the longitudinal bearing surface enables retraction ofthe needle seal assembly. In some embodiments, the longitudinal bearingsurface constrains against extension and retraction in directions otherthan parallel to the longitudinal needle lumen axis. In someembodiments, the longitudinal bearing surface enables linear retractionof the removable needle seal assembly to reduce bending loads on theneedle 2260.

FIG. 23 shows an illustration of another exemplary injector system 2300comprising a latching retainer sheath component 2350 that latches aboutand on to the syringe 2010. As shown, the latching retainer sheathcomponent 2350 couples to the syringe 2010 by a flexure and a clip.Alternatively, in some embodiments, the latching retainer sheathcomponent 2350 couples to the syringe 2010 by a hinge, a screw, a nut, aslide, a clamp, a bolt, a tie, or any combination thereof. Further, perFIGS. 23 and 24 , in some embodiments, the exemplary injector system2300 further comprises a removable push pin retainer 2390 that preventsmovement of the latching retainer sheath component 2350 with respect tothe needle 1620, when engaged. In some embodiments, the removable pushpin retainer 2390 removably couples the latching retainer sheathcomponent 2350 to a side wall of the needle 1620. In some embodiments,the removable push pin retainer 2390 comprises a pin, a tie, a clip, aflexure, a switch, or any combination thereof. Further, per FIG. 24 , insome embodiments, the exemplary injector system 2300 further acommercially available syringe, comprising a distal plunger protrusionthat advances the push pin 1690 and an anti-buckling constraint 2410that constrains the proximal push pin head within a linear path at afixed angle parallel to the needle lumen axis. The anti-bucklingconstraint 2410 prevents the push pin 1690 from buckling during plunger,push wire, and implant advancement. In some embodiments, the sheathinterface 2420 enables easier insertion of the sheath 1650 over theneedle 1620 and linear retraction of the sheath over the needle.

FIG. 25 shows a perspective cross-sectioned illustration of an exemplarythird injector system. As seen therein, in some embodiments, an outersurface of the plunger housing has a surface treatment to improve grip.FIGS. 26-29 show front view illustrations of exemplary plungers of thethird injector system. FIGS. 30-31 show front cross-sectioned viewillustrations of an exemplary plunger housing of the third injectorsystem.

Methods of Injecting an Implant into an Eye of a Patient

Another aspect provided herein is a method for injecting an implant intoan eye of a patient, wherein the method comprises: providing an injectorsystem and injecting the implant into the eye of the patient.

In some embodiments, the system for injecting an implant into an eye ofa patient has an unsheathed state and a sheathed state. In someembodiments, the system for injecting an implant into an eye of apatient comprises a needle assembly and a plunger assembly removablycoupled to the needle assembly. In some embodiments, the needle assemblycomprises a needle housing, a needle, and a needle lumen, the implantinside the needle lumen, and a push pin at least partially disposedwithin the needle lumen. In some embodiments, the plunger assemblycomprises: a plunger housing and a plunger slidably disposed within theplunger housing.

In some embodiments, injecting the implant into the eye of the patientcomprises translating the plunger within the plunger housing to engagethe push pin and translate the push pin within the needle such that adistal surface of the needle contacts the implant and translates theimplant out of the needle and into the eye of the patient.

EXAMPLES

The following illustrative examples are representative of embodiments ofthe devices and methods described herein and are not meant to belimiting in any way. In one example, the needle housing is received withthe implant within the needle. A technician or medical practitioner thenattaches the needle housing to the plunger assembly. During operation,the medical practitioner unsheathes the needle assembly and inserts theneedle into the eye of the patient until the distal portion of theneedle sheath abuts against the eye of the patient. The technician thenapplies a distal force to the plunger to decouple the first stop featurefrom the primary second stop feature. The distal force distallytranslates the plunger such that distal portion of the plunger distallytranslates the push pin, which translates the implant within the needleinto the eye of the patient. Once the first stop feature is decoupledfrom and distal to the secondary stop feature, the distal force isreleased, wherein the push pin retracts proximally, and the first stopfeature couples to the secondary stop feature. The medical practitionerthen removes the needle from the eye of the patient.

While preferred embodiments of the present disclosure have been shownand described herein, it will be obvious to those skilled in the artthat such embodiments are provided by way of example only. Numerousvariations, changes, and substitutions will now occur to those skilledin the art without departing from the disclosure. It should beunderstood that various alternatives to the embodiments of thedisclosure described herein may be employed in practicing thedisclosure.

Terms and Definitions

Unless otherwise defined, all technical terms used herein have the samemeaning as commonly understood by one of ordinary skill in the art towhich this disclosure belongs.

As used herein, the term “biopsy punch” refers to a sharp, hollow,circular instrument for extracting a round piece of tissue.

As used herein, the term “proximal” refers to a direction towards theuser of the device and away from the patient.

As used herein, the term “distal” refers to a direction away from theuser of the device and towards the patient.

As used herein, the term “lumen” refers to the hollow portion of aneedle in which a medicament is transferred.

As used herein, the singular forms “a,” “an,” and “the” include pluralreferences unless the context clearly dictates otherwise. Any referenceto “or” herein is intended to encompass “and/or” unless otherwisestated.

As used herein, the term “about” refers to an amount that is near thestated amount by 10%, 5%, or 1%, including increments therein.

As used herein, the term “about” in reference to a percentage refers toan amount that is greater or less the stated percentage by 10%, 5%, or1%, including increments therein.

As used herein, the phrases “at least one”, “one or more”, and “and/or”are open-ended expressions that are both conjunctive and disjunctive inoperation. For example, each of the expressions “at least one of A, Band C”, “at least one of A, B, or C”, “one or more of A, B, and C”, “oneor more of A, B, or C” and “A, B, and/or C” means A alone, B alone, Calone, A and B together, A and C together, B and C together, or A, B andC together.

While preferred embodiments of the present disclosure have been shownand described herein, it will be obvious to those skilled in the artthat such embodiments are provided by way of example only. Numerousvariations, changes, and substitutions will now occur to those skilledin the art without departing from the disclosure. It should beunderstood that various alternatives to the embodiments of thedisclosure described herein may be employed in practicing thedisclosure.

What is claimed is:
 1. An injector system for injecting an implant intoan eye of a patient having an unsheathed state and a sheathed state, thesystem comprising: (a) a plunger assembly comprising: (i) a plungerhousing; and (ii) a plunger slidably disposed within the plungerhousing, wherein a distal end of the plunger being engaged with the pushpin of the needle assembly when in a distal position within the plungerhousing; and (b) a needle assembly comprising: (i) a needle housinghaving a proximal end and a distal end; (ii) a needle having a proximalend attached to the distal end of the needle housing or within theneedle housing, a distal end extending beyond the distal end of theneedle housing, and a needle lumen at the distal end of the needle;(iii) the needle lumen being configured to receive an implant positionedtherewithin; and (iv) a push pin having a head and a push rod, wherein adistal end of the push rod is disposed within the needle lumen, andwherein translating the push pin in a distal direction ejects theimplant from the needle lumen and into the eye of the patient.
 2. Theinjector system of claim 1, wherein the distal end of the plungerengages the head of the push pin.
 3. The injector system of claim 1,wherein the plunger is manually actuated to translate distally withinthe plunger housing.
 4. The injector system of claim 1, wherein aproximal end of the plunger assembly protrudes beyond the plungerhousing.
 5. The injector system of claim 1, wherein the plunger ismechanically actuated to translate distally within the plunger housing.6. The injector system of claim 1, wherein the plunger assembly furthercomprises a compression spring biasing the plunger towards a proximalend of the plunger housing.
 7. The injector system of claim 6, whereinthe compression spring has a distal end connected to the plunger housingand a proximal end connected to the plunger.
 8. The injector system ofclaim 1, wherein the plunger comprises a first stop feature, wherein theplunger housing comprises a second stop feature engageable with thefirst stop feature.
 9. The injector system of claim 8, wherein thesecond stop feature comprises a primary second stop and a secondarysecond stop.
 10. The injector system of claim 1, wherein the needleassembly further comprises a resilient member disposed within the needlehousing.
 11. The injector system of claim 10, wherein the resilientmember proximally biases the push pin.
 12. The injector system of claim1, wherein the needle assembly further comprises a needle sheath havinga proximal portion surrounding the distal end of the needle housing, anda distal portion surrounding the distal end of the needle.
 13. Theinjector system of claim 12, wherein the needle sheath is removable fromthe needle housing by translating in a distal direction away from theneedle housing to expose the needle.
 14. The injector system of claim12, wherein the needle sheath translates proximally to the unsheathedstate where the distal end of the needle extends beyond the distalportion of the needle sheath.
 15. The injector system of claim 1,further comprising a needle seal at the distal end of the needle thatseals the distal end of the needle lumen.
 16. The injector system ofclaim 15, wherein the needle seal is within a distal portion of theneedle sheath.
 17. The injector system of claim 15, wherein the needleseal is pierced by translating the needle sheath in a proximaldirection.
 18. The injector system of claim 15, wherein the needle has alength such that the distal end of the needle is within the needle sealwhen the system is in a sheathed state.
 19. The injector system of claim15, wherein the needle assembly further comprises a removable push pinretainer that prevents movement of the needle housing relative to theneedle sheath when engaged.
 20. The injector system of claim 19, whereinthe removable push pin retainer removably couples the push pin to theneedle housing.